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Related Concept Videos

What are Populations and Communities?00:30

What are Populations and Communities?

Populations are groups of individuals of the same species that inhabit a shared environment. Communities include multiple co-existing, interacting populations of different species. Metapopulations span multiple populations of the same species that occupy different areas. Metapopulations interact through immigration and emigration, providing genetic diversity that lends resilience to harsh environments. Population size and density can be estimated using quadrat and mark and recapture...
Population Growth00:57

Population Growth

Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.However, realistic environmental conditions limit the number of...
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
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Conservation of Small Populations

Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less likely to...
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Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
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Related Experiment Video

Updated: Jul 11, 2026

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling
20:36

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling

Published on: July 4, 2007

Evolution in a metapopulation with space-limited subpopulations.

Y Iwasa1, J Roughgarden

  • 1Department of Biology, Faculty of Science, Kyushu University, Fukuoka, Japan.

IMA Journal of Mathematics Applied in Medicine and Biology
|January 1, 1985
PubMed
Summary

This study models metapopulation dynamics with genetic variation, revealing that new alleles increase if they boost larval productivity relative to mortality. This offers insights into life-history evolution for sessile marine invertebrates.

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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Area of Science:

  • Evolutionary biology
  • Population genetics
  • Ecological modeling

Background:

  • Metapopulation dynamics models often simplify genetic variation.
  • Life-history traits in sessile organisms with pelagic larvae present unique evolutionary challenges.

Purpose of the Study:

  • To extend metapopulation models to incorporate genetic variation in life-history traits.
  • To derive conditions for the evolutionary increase of new alleles in such systems.
  • To develop a criterion for predicting evolutionary trajectories in sessile marine invertebrates.

Main Methods:

  • Mathematical modeling of metapopulation dynamics.
  • Inclusion of genetic variation for traits of sessile adults and dispersing larvae.
  • Derivation of allele frequency change using age-structured and age-independent models.

Main Results:

  • A general criterion for evolutionary change was derived: increase occurs if larval productivity, weighted by unoccupied space, exceeds larval mortality.
  • Two formulations (with and without age-structure) yielded consistent evolutionary criteria.
  • Basal area in space-limited populations was identified as a selectively neutral trait.

Conclusions:

  • The derived criterion provides a framework for understanding life-history evolution in sessile marine invertebrates.
  • The model highlights the importance of larval dispersal and subpopulation space in evolutionary dynamics.
  • Further theoretical development is suggested for this class of organisms.